arch/blackfin/kernel/traps.c

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later
   5  */
   6
   7 #include <linux/bug.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/module.h>
  11 #include <linux/kallsyms.h>
  12 #include <linux/fs.h>
  13 #include <linux/rbtree.h>
  14 #include <asm/traps.h>
  15 #include <asm/cacheflush.h>
  16 #include <asm/cplb.h>
  17 #include <asm/dma.h>
  18 #include <asm/blackfin.h>
  19 #include <asm/irq_handler.h>
  20 #include <linux/irq.h>
  21 #include <asm/trace.h>
  22 #include <asm/fixed_code.h>
  23
  24 #ifdef CONFIG_KGDB
  25 # include <linux/kgdb.h>
  26
  27 # define CHK_DEBUGGER_TRAP() \
  28         do { \
  29                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  30         } while (0)
  31 # define CHK_DEBUGGER_TRAP_MAYBE() \
  32         do { \
  33                 if (kgdb_connected) \
  34                         CHK_DEBUGGER_TRAP(); \
  35         } while (0)
  36 #else
  37 # define CHK_DEBUGGER_TRAP() do { } while (0)
  38 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  39 #endif
  40
  41
  42 #ifdef CONFIG_DEBUG_VERBOSE
  43 #define verbose_printk(fmt, arg...) \
  44         printk(fmt, ##arg)
  45 #else
  46 #define verbose_printk(fmt, arg...) \
  47         ({ if (0) printk(fmt, ##arg); 0; })
  48 #endif
  49
  50 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  51 u32 last_seqstat;
  52 #ifdef CONFIG_DEBUG_MMRS_MODULE
  53 EXPORT_SYMBOL(last_seqstat);
  54 #endif
  55 #endif
  56
  57 /* Initiate the event table handler */
  58 void __init trap_init(void)
  59 {
  60         CSYNC();
  61         bfin_write_EVT3(trap);
  62         CSYNC();
  63 }
  64
  65 static void decode_address(char *buf, unsigned long address)
  66 {
  67 #ifdef CONFIG_DEBUG_VERBOSE
  68         struct task_struct *p;
  69         struct mm_struct *mm;
  70         unsigned long flags, offset;
  71         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  72         struct rb_node *n;
  73
  74 #ifdef CONFIG_KALLSYMS
  75         unsigned long symsize;
  76         const char *symname;
  77         char *modname;
  78         char *delim = ":";
  79         char namebuf[128];
  80 #endif
  81
  82         buf += sprintf(buf, "<0x%08lx> ", address);
  83
  84 #ifdef CONFIG_KALLSYMS
  85         /* look up the address and see if we are in kernel space */
  86         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  87
  88         if (symname) {
  89                 /* yeah! kernel space! */
  90                 if (!modname)
  91                         modname = delim = "";
  92                 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
  93                         delim, modname, delim, symname,
  94                         (unsigned long)offset);
  95                 return;
  96         }
  97 #endif
  98
  99         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 100                 /* Problem in fixed code section? */
 101                 strcat(buf, "/* Maybe fixed code section */");
 102                 return;
 103
 104         } else if (address < CONFIG_BOOT_LOAD) {
 105                 /* Problem somewhere before the kernel start address */
 106                 strcat(buf, "/* Maybe null pointer? */");
 107                 return;
 108
 109         } else if (address >= COREMMR_BASE) {
 110                 strcat(buf, "/* core mmrs */");
 111                 return;
 112
 113         } else if (address >= SYSMMR_BASE) {
 114                 strcat(buf, "/* system mmrs */");
 115                 return;
 116
 117         } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
 118                 strcat(buf, "/* on-chip L1 ROM */");
 119                 return;
 120         }
 121
 122         /*
 123          * Don't walk any of the vmas if we are oopsing, it has been known
 124          * to cause problems - corrupt vmas (kernel crashes) cause double faults
 125          */
 126         if (oops_in_progress) {
 127                 strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
 128                 return;
 129         }
 130
 131         /* looks like we're off in user-land, so let's walk all the
 132          * mappings of all our processes and see if we can't be a whee
 133          * bit more specific
 134          */
 135         write_lock_irqsave(&tasklist_lock, flags);
 136         for_each_process(p) {
 137                 mm = (in_atomic ? p->mm : get_task_mm(p));
 138                 if (!mm)
 139                         continue;
 140
 141                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 142                         struct vm_area_struct *vma;
 143
 144                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 145
 146                         if (address >= vma->vm_start && address < vma->vm_end) {
 147                                 char _tmpbuf[256];
 148                                 char *name = p->comm;
 149                                 struct file *file = vma->vm_file;
 150
 151                                 if (file) {
 152                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 153                                                       sizeof(_tmpbuf));
 154                                         if (!IS_ERR(d_name))
 155                                                 name = d_name;
 156                                 }
 157
 158                                 /* FLAT does not have its text aligned to the start of
 159                                  * the map while FDPIC ELF does ...
 160                                  */
 161
 162                                 /* before we can check flat/fdpic, we need to
 163                                  * make sure current is valid
 164                                  */
 165                                 if ((unsigned long)current >= FIXED_CODE_START &&
 166                                     !((unsigned long)current & 0x3)) {
 167                                         if (current->mm &&
 168                                             (address > current->mm->start_code) &&
 169                                             (address < current->mm->end_code))
 170                                                 offset = address - current->mm->start_code;
 171                                         else
 172                                                 offset = (address - vma->vm_start) +
 173                                                          (vma->vm_pgoff << PAGE_SHIFT);
 174
 175                                         sprintf(buf, "[ %s + 0x%lx ]", name, offset);
 176                                 } else
 177                                         sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
 178                                                 name, vma->vm_start, vma->vm_end);
 179
 180                                 if (!in_atomic)
 181                                         mmput(mm);
 182
 183                                 if (buf[0] == '\0')
 184                                         sprintf(buf, "[ %s ] dynamic memory", name);
 185
 186                                 goto done;
 187                         }
 188                 }
 189                 if (!in_atomic)
 190                         mmput(mm);
 191         }
 192
 193         /* we were unable to find this address anywhere */
 194         sprintf(buf, "/* kernel dynamic memory */");
 195
 196 done:
 197         write_unlock_irqrestore(&tasklist_lock, flags);
 198 #else
 199         sprintf(buf, " ");
 200 #endif
 201 }
 202
 203 asmlinkage void double_fault_c(struct pt_regs *fp)
 204 {
 205 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 206         int j;
 207         trace_buffer_save(j);
 208 #endif
 209
 210         console_verbose();
 211         oops_in_progress = 1;
 212 #ifdef CONFIG_DEBUG_VERBOSE
 213         printk(KERN_EMERG "Double Fault\n");
 214 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 215         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 216                 unsigned int cpu = raw_smp_processor_id();
 217                 char buf[150];
 218                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
 219                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 220                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 221                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 222                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 223                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 224                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 225
 226                 decode_address(buf, fp->retx);
 227                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 228         } else
 229 #endif
 230         {
 231                 dump_bfin_process(fp);
 232                 dump_bfin_mem(fp);
 233                 show_regs(fp);
 234                 dump_bfin_trace_buffer();
 235         }
 236 #endif
 237         panic("Double Fault - unrecoverable event");
 238
 239 }
 240
 241 static int kernel_mode_regs(struct pt_regs *regs)
 242 {
 243         return regs->ipend & 0xffc0;
 244 }
 245
 246 asmlinkage notrace void trap_c(struct pt_regs *fp)
 247 {
 248 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 249         int j;
 250 #endif
 251 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 252         unsigned int cpu = raw_smp_processor_id();
 253 #endif
 254         const char *strerror = NULL;
 255         int sig = 0;
 256         siginfo_t info;
 257         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 258
 259         trace_buffer_save(j);
 260 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 261         last_seqstat = (u32)fp->seqstat;
 262 #endif
 263
 264         /* Important - be very careful dereferncing pointers - will lead to
 265          * double faults if the stack has become corrupt
 266          */
 267
 268         /* trap_c() will be called for exceptions. During exceptions
 269          * processing, the pc value should be set with retx value.
 270          * With this change we can cleanup some code in signal.c- TODO
 271          */
 272         fp->orig_pc = fp->retx;
 273         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 274                 trapnr, fp->ipend, fp->pc, fp->retx); */
 275
 276         /* send the appropriate signal to the user program */
 277         switch (trapnr) {
 278
 279         /* This table works in conjuction with the one in ./mach-common/entry.S
 280          * Some exceptions are handled there (in assembly, in exception space)
 281          * Some are handled here, (in C, in interrupt space)
 282          * Some, like CPLB, are handled in both, where the normal path is
 283          * handled in assembly/exception space, and the error path is handled
 284          * here
 285          */
 286
 287         /* 0x00 - Linux Syscall, getting here is an error */
 288         /* 0x01 - userspace gdb breakpoint, handled here */
 289         case VEC_EXCPT01:
 290                 info.si_code = TRAP_ILLTRAP;
 291                 sig = SIGTRAP;
 292                 CHK_DEBUGGER_TRAP_MAYBE();
 293                 /* Check if this is a breakpoint in kernel space */
 294                 if (kernel_mode_regs(fp))
 295                         goto traps_done;
 296                 else
 297                         break;
 298         /* 0x03 - User Defined, userspace stack overflow */
 299         case VEC_EXCPT03:
 300                 info.si_code = SEGV_STACKFLOW;
 301                 sig = SIGSEGV;
 302                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 303                 CHK_DEBUGGER_TRAP_MAYBE();
 304                 break;
 305         /* 0x02 - KGDB initial connection and break signal trap */
 306         case VEC_EXCPT02:
 307 #ifdef CONFIG_KGDB
 308                 info.si_code = TRAP_ILLTRAP;
 309                 sig = SIGTRAP;
 310                 CHK_DEBUGGER_TRAP();
 311                 goto traps_done;
 312 #endif
 313         /* 0x04 - User Defined */
 314         /* 0x05 - User Defined */
 315         /* 0x06 - User Defined */
 316         /* 0x07 - User Defined */
 317         /* 0x08 - User Defined */
 318         /* 0x09 - User Defined */
 319         /* 0x0A - User Defined */
 320         /* 0x0B - User Defined */
 321         /* 0x0C - User Defined */
 322         /* 0x0D - User Defined */
 323         /* 0x0E - User Defined */
 324         /* 0x0F - User Defined */
 325         /* If we got here, it is most likely that someone was trying to use a
 326          * custom exception handler, and it is not actually installed properly
 327          */
 328         case VEC_EXCPT04 ... VEC_EXCPT15:
 329                 info.si_code = ILL_ILLPARAOP;
 330                 sig = SIGILL;
 331                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 332                 CHK_DEBUGGER_TRAP_MAYBE();
 333                 break;
 334         /* 0x10 HW Single step, handled here */
 335         case VEC_STEP:
 336                 info.si_code = TRAP_STEP;
 337                 sig = SIGTRAP;
 338                 CHK_DEBUGGER_TRAP_MAYBE();
 339                 /* Check if this is a single step in kernel space */
 340                 if (kernel_mode_regs(fp))
 341                         goto traps_done;
 342                 else
 343                         break;
 344         /* 0x11 - Trace Buffer Full, handled here */
 345         case VEC_OVFLOW:
 346                 info.si_code = TRAP_TRACEFLOW;
 347                 sig = SIGTRAP;
 348                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 349                 CHK_DEBUGGER_TRAP_MAYBE();
 350                 break;
 351         /* 0x12 - Reserved, Caught by default */
 352         /* 0x13 - Reserved, Caught by default */
 353         /* 0x14 - Reserved, Caught by default */
 354         /* 0x15 - Reserved, Caught by default */
 355         /* 0x16 - Reserved, Caught by default */
 356         /* 0x17 - Reserved, Caught by default */
 357         /* 0x18 - Reserved, Caught by default */
 358         /* 0x19 - Reserved, Caught by default */
 359         /* 0x1A - Reserved, Caught by default */
 360         /* 0x1B - Reserved, Caught by default */
 361         /* 0x1C - Reserved, Caught by default */
 362         /* 0x1D - Reserved, Caught by default */
 363         /* 0x1E - Reserved, Caught by default */
 364         /* 0x1F - Reserved, Caught by default */
 365         /* 0x20 - Reserved, Caught by default */
 366         /* 0x21 - Undefined Instruction, handled here */
 367         case VEC_UNDEF_I:
 368 #ifdef CONFIG_BUG
 369                 if (kernel_mode_regs(fp)) {
 370                         switch (report_bug(fp->pc, fp)) {
 371                         case BUG_TRAP_TYPE_NONE:
 372                                 break;
 373                         case BUG_TRAP_TYPE_WARN:
 374                                 dump_bfin_trace_buffer();
 375                                 fp->pc += 2;
 376                                 goto traps_done;
 377                         case BUG_TRAP_TYPE_BUG:
 378                                 /* call to panic() will dump trace, and it is
 379                                  * off at this point, so it won't be clobbered
 380                                  */
 381                                 panic("BUG()");
 382                         }
 383                 }
 384 #endif
 385                 info.si_code = ILL_ILLOPC;
 386                 sig = SIGILL;
 387                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 388                 CHK_DEBUGGER_TRAP_MAYBE();
 389                 break;
 390         /* 0x22 - Illegal Instruction Combination, handled here */
 391         case VEC_ILGAL_I:
 392                 info.si_code = ILL_ILLPARAOP;
 393                 sig = SIGILL;
 394                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 395                 CHK_DEBUGGER_TRAP_MAYBE();
 396                 break;
 397         /* 0x23 - Data CPLB protection violation, handled here */
 398         case VEC_CPLB_VL:
 399                 info.si_code = ILL_CPLB_VI;
 400                 sig = SIGSEGV;
 401                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 402                 CHK_DEBUGGER_TRAP_MAYBE();
 403                 break;
 404         /* 0x24 - Data access misaligned, handled here */
 405         case VEC_MISALI_D:
 406                 info.si_code = BUS_ADRALN;
 407                 sig = SIGBUS;
 408                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 409                 CHK_DEBUGGER_TRAP_MAYBE();
 410                 break;
 411         /* 0x25 - Unrecoverable Event, handled here */
 412         case VEC_UNCOV:
 413                 info.si_code = ILL_ILLEXCPT;
 414                 sig = SIGILL;
 415                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 416                 CHK_DEBUGGER_TRAP_MAYBE();
 417                 break;
 418         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 419                 error case is handled here */
 420         case VEC_CPLB_M:
 421                 info.si_code = BUS_ADRALN;
 422                 sig = SIGBUS;
 423                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 424                 break;
 425         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 426         case VEC_CPLB_MHIT:
 427                 info.si_code = ILL_CPLB_MULHIT;
 428                 sig = SIGSEGV;
 429 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 430                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 431                         strerror = KERN_NOTICE "NULL pointer access\n";
 432                 else
 433 #endif
 434                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 435                 CHK_DEBUGGER_TRAP_MAYBE();
 436                 break;
 437         /* 0x28 - Emulation Watchpoint, handled here */
 438         case VEC_WATCH:
 439                 info.si_code = TRAP_WATCHPT;
 440                 sig = SIGTRAP;
 441                 pr_debug(EXC_0x28(KERN_DEBUG));
 442                 CHK_DEBUGGER_TRAP_MAYBE();
 443                 /* Check if this is a watchpoint in kernel space */
 444                 if (kernel_mode_regs(fp))
 445                         goto traps_done;
 446                 else
 447                         break;
 448 #ifdef CONFIG_BF535
 449         /* 0x29 - Instruction fetch access error (535 only) */
 450         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 451                 info.si_code = BUS_OPFETCH;
 452                 sig = SIGBUS;
 453                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 454                 CHK_DEBUGGER_TRAP_MAYBE();
 455                 break;
 456 #else
 457         /* 0x29 - Reserved, Caught by default */
 458 #endif
 459         /* 0x2A - Instruction fetch misaligned, handled here */
 460         case VEC_MISALI_I:
 461                 info.si_code = BUS_ADRALN;
 462                 sig = SIGBUS;
 463                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 464                 CHK_DEBUGGER_TRAP_MAYBE();
 465                 break;
 466         /* 0x2B - Instruction CPLB protection violation, handled here */
 467         case VEC_CPLB_I_VL:
 468                 info.si_code = ILL_CPLB_VI;
 469                 sig = SIGBUS;
 470                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 471                 CHK_DEBUGGER_TRAP_MAYBE();
 472                 break;
 473         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 474         case VEC_CPLB_I_M:
 475                 info.si_code = ILL_CPLB_MISS;
 476                 sig = SIGBUS;
 477                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 478                 break;
 479         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 480         case VEC_CPLB_I_MHIT:
 481                 info.si_code = ILL_CPLB_MULHIT;
 482                 sig = SIGSEGV;
 483 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 484                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 485                         strerror = KERN_NOTICE "Jump to NULL address\n";
 486                 else
 487 #endif
 488                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 489                 CHK_DEBUGGER_TRAP_MAYBE();
 490                 break;
 491         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 492         case VEC_ILL_RES:
 493                 info.si_code = ILL_PRVOPC;
 494                 sig = SIGILL;
 495                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 496                 CHK_DEBUGGER_TRAP_MAYBE();
 497                 break;
 498         /* 0x2F - Reserved, Caught by default */
 499         /* 0x30 - Reserved, Caught by default */
 500         /* 0x31 - Reserved, Caught by default */
 501         /* 0x32 - Reserved, Caught by default */
 502         /* 0x33 - Reserved, Caught by default */
 503         /* 0x34 - Reserved, Caught by default */
 504         /* 0x35 - Reserved, Caught by default */
 505         /* 0x36 - Reserved, Caught by default */
 506         /* 0x37 - Reserved, Caught by default */
 507         /* 0x38 - Reserved, Caught by default */
 508         /* 0x39 - Reserved, Caught by default */
 509         /* 0x3A - Reserved, Caught by default */
 510         /* 0x3B - Reserved, Caught by default */
 511         /* 0x3C - Reserved, Caught by default */
 512         /* 0x3D - Reserved, Caught by default */
 513         /* 0x3E - Reserved, Caught by default */
 514         /* 0x3F - Reserved, Caught by default */
 515         case VEC_HWERR:
 516                 info.si_code = BUS_ADRALN;
 517                 sig = SIGBUS;
 518                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 519                 /* System MMR Error */
 520                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 521                         info.si_code = BUS_ADRALN;
 522                         sig = SIGBUS;
 523                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 524                         break;
 525                 /* External Memory Addressing Error */
 526                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 527                         if (ANOMALY_05000310) {
 528                                 static unsigned long anomaly_rets;
 529
 530                                 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 531                                     (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
 532                                         /*
 533                                          * A false hardware error will happen while fetching at
 534                                          * the L1 instruction SRAM boundary.  Ignore it.
 535                                          */
 536                                         anomaly_rets = fp->rets;
 537                                         goto traps_done;
 538                                 } else if (fp->rets == anomaly_rets) {
 539                                         /*
 540                                          * While boundary code returns to a function, at the ret
 541                                          * point, a new false hardware error might occur too based
 542                                          * on tests.  Ignore it too.
 543                                          */
 544                                         goto traps_done;
 545                                 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 546                                            (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
 547                                         /*
 548                                          * If boundary code calls a function, at the entry point,
 549                                          * a new false hardware error maybe happen based on tests.
 550                                          * Ignore it too.
 551                                          */
 552                                         goto traps_done;
 553                                 } else
 554                                         anomaly_rets = 0;
 555                         }
 556
 557                         info.si_code = BUS_ADRERR;
 558                         sig = SIGBUS;
 559                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 560                         break;
 561                 /* Performance Monitor Overflow */
 562                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 563                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 564                         break;
 565                 /* RAISE 5 instruction */
 566                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 567                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 568                         break;
 569                 default:        /* Reserved */
 570                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 571                         break;
 572                 }
 573                 CHK_DEBUGGER_TRAP_MAYBE();
 574                 break;
 575         /*
 576          * We should be handling all known exception types above,
 577          * if we get here we hit a reserved one, so panic
 578          */
 579         default:
 580                 info.si_code = ILL_ILLPARAOP;
 581                 sig = SIGILL;
 582                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 583                         (fp->seqstat & SEQSTAT_EXCAUSE));
 584                 CHK_DEBUGGER_TRAP_MAYBE();
 585                 break;
 586         }
 587
 588         BUG_ON(sig == 0);
 589
 590         /* If the fault was caused by a kernel thread, or interrupt handler
 591          * we will kernel panic, so the system reboots.
 592          */
 593         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 594                 console_verbose();
 595                 oops_in_progress = 1;
 596         }
 597
 598         if (sig != SIGTRAP) {
 599                 if (strerror)
 600                         verbose_printk(strerror);
 601
 602                 dump_bfin_process(fp);
 603                 dump_bfin_mem(fp);
 604                 show_regs(fp);
 605
 606                 /* Print out the trace buffer if it makes sense */
 607 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 608                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 609                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 610                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 611                 else
 612 #endif
 613                         dump_bfin_trace_buffer();
 614
 615                 if (oops_in_progress) {
 616                         /* Dump the current kernel stack */
 617                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 618                         show_stack(current, NULL);
 619                         print_modules();
 620 #ifndef CONFIG_ACCESS_CHECK
 621                         verbose_printk(KERN_EMERG "Please turn on "
 622                                "CONFIG_ACCESS_CHECK\n");
 623 #endif
 624                         panic("Kernel exception");
 625                 } else {
 626 #ifdef CONFIG_DEBUG_VERBOSE
 627                         unsigned long *stack;
 628                         /* Dump the user space stack */
 629                         stack = (unsigned long *)rdusp();
 630                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 631                         show_stack(NULL, stack);
 632 #endif
 633                 }
 634         }
 635
 636 #ifdef CONFIG_IPIPE
 637         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 638 #endif
 639         {
 640                 info.si_signo = sig;
 641                 info.si_errno = 0;
 642                 info.si_addr = (void __user *)fp->pc;
 643                 force_sig_info(sig, &info, current);
 644         }
 645
 646         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 647             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 648             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 649                 fp->pc = SAFE_USER_INSTRUCTION;
 650
 651  traps_done:
 652         trace_buffer_restore(j);
 653 }
 654
 655 /* Typical exception handling routines  */
 656
 657 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 658
 659 /*
 660  * Similar to get_user, do some address checking, then dereference
 661  * Return true on success, false on bad address
 662  */
 663 static bool get_instruction(unsigned short *val, unsigned short *address)
 664 {
 665         unsigned long addr = (unsigned long)address;
 666
 667         /* Check for odd addresses */
 668         if (addr & 0x1)
 669                 return false;
 670
 671         /* MMR region will never have instructions */
 672         if (addr >= SYSMMR_BASE)
 673                 return false;
 674
 675         switch (bfin_mem_access_type(addr, 2)) {
 676                 case BFIN_MEM_ACCESS_CORE:
 677                 case BFIN_MEM_ACCESS_CORE_ONLY:
 678                         *val = *address;
 679                         return true;
 680                 case BFIN_MEM_ACCESS_DMA:
 681                         dma_memcpy(val, address, 2);
 682                         return true;
 683                 case BFIN_MEM_ACCESS_ITEST:
 684                         isram_memcpy(val, address, 2);
 685                         return true;
 686                 default: /* invalid access */
 687                         return false;
 688         }
 689 }
 690
 691 /*
 692  * decode the instruction if we are printing out the trace, as it
 693  * makes things easier to follow, without running it through objdump
 694  * These are the normal instructions which cause change of flow, which
 695  * would be at the source of the trace buffer
 696  */
 697 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 698 static void decode_instruction(unsigned short *address)
 699 {
 700         unsigned short opcode;
 701
 702         if (get_instruction(&opcode, address)) {
 703                 if (opcode == 0x0010)
 704                         verbose_printk("RTS");
 705                 else if (opcode == 0x0011)
 706                         verbose_printk("RTI");
 707                 else if (opcode == 0x0012)
 708                         verbose_printk("RTX");
 709                 else if (opcode == 0x0013)
 710                         verbose_printk("RTN");
 711                 else if (opcode == 0x0014)
 712                         verbose_printk("RTE");
 713                 else if (opcode == 0x0025)
 714                         verbose_printk("EMUEXCPT");
 715                 else if (opcode == 0x0040 && opcode <= 0x0047)
 716                         verbose_printk("STI R%i", opcode & 7);
 717                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 718                         verbose_printk("JUMP (P%i)", opcode & 7);
 719                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 720                         verbose_printk("CALL (P%i)", opcode & 7);
 721                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 722                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 723                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 724                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 725                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 726                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 727                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 728                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 729                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 730                         verbose_printk("IF !CC JUMP");
 731                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 732                         verbose_printk("IF CC JUMP");
 733                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 734                         verbose_printk("JUMP.S");
 735                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 736                         verbose_printk("LSETUP");
 737                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 738                         verbose_printk("JUMP.L");
 739                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 740                         verbose_printk("CALL pcrel");
 741                 else
 742                         verbose_printk("0x%04x", opcode);
 743         }
 744
 745 }
 746 #endif
 747
 748 void dump_bfin_trace_buffer(void)
 749 {
 750 #ifdef CONFIG_DEBUG_VERBOSE
 751 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 752         int tflags, i = 0;
 753         char buf[150];
 754         unsigned short *addr;
 755 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 756         int j, index;
 757 #endif
 758
 759         trace_buffer_save(tflags);
 760
 761         printk(KERN_NOTICE "Hardware Trace:\n");
 762
 763 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 764         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 765 #endif
 766
 767         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 768                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 769                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 770                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 771                         addr = (unsigned short *)bfin_read_TBUF();
 772                         decode_address(buf, (unsigned long)addr);
 773                         printk(KERN_NOTICE "     Source : %s ", buf);
 774                         decode_instruction(addr);
 775                         printk("\n");
 776                 }
 777         }
 778
 779 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 780         if (trace_buff_offset)
 781                 index = trace_buff_offset / 4;
 782         else
 783                 index = EXPAND_LEN;
 784
 785         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 786         while (j) {
 787                 decode_address(buf, software_trace_buff[index]);
 788                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 789                 index -= 1;
 790                 if (index < 0 )
 791                         index = EXPAND_LEN;
 792                 decode_address(buf, software_trace_buff[index]);
 793                 printk(KERN_NOTICE "     Source : %s ", buf);
 794                 decode_instruction((unsigned short *)software_trace_buff[index]);
 795                 printk("\n");
 796                 index -= 1;
 797                 if (index < 0)
 798                         index = EXPAND_LEN;
 799                 j--;
 800                 i++;
 801         }
 802 #endif
 803
 804         trace_buffer_restore(tflags);
 805 #endif
 806 #endif
 807 }
 808 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 809
 810 #ifdef CONFIG_BUG
 811 int is_valid_bugaddr(unsigned long addr)
 812 {
 813         unsigned short opcode;
 814
 815         if (!get_instruction(&opcode, (unsigned short *)addr))
 816                 return 0;
 817
 818         return opcode == BFIN_BUG_OPCODE;
 819 }
 820 #endif
 821
 822 /*
 823  * Checks to see if the address pointed to is either a
 824  * 16-bit CALL instruction, or a 32-bit CALL instruction
 825  */
 826 static bool is_bfin_call(unsigned short *addr)
 827 {
 828         unsigned short opcode = 0, *ins_addr;
 829         ins_addr = (unsigned short *)addr;
 830
 831         if (!get_instruction(&opcode, ins_addr))
 832                 return false;
 833
 834         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 835             (opcode >= 0x0070 && opcode <= 0x0077))
 836                 return true;
 837
 838         ins_addr--;
 839         if (!get_instruction(&opcode, ins_addr))
 840                 return false;
 841
 842         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 843                 return true;
 844
 845         return false;
 846
 847 }
 848
 849 void show_stack(struct task_struct *task, unsigned long *stack)
 850 {
 851 #ifdef CONFIG_PRINTK
 852         unsigned int *addr, *endstack, *fp = 0, *frame;
 853         unsigned short *ins_addr;
 854         char buf[150];
 855         unsigned int i, j, ret_addr, frame_no = 0;
 856
 857         /*
 858          * If we have been passed a specific stack, use that one otherwise
 859          *    if we have been passed a task structure, use that, otherwise
 860          *    use the stack of where the variable "stack" exists
 861          */
 862
 863         if (stack == NULL) {
 864                 if (task) {
 865                         /* We know this is a kernel stack, so this is the start/end */
 866                         stack = (unsigned long *)task->thread.ksp;
 867                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 868                 } else {
 869                         /* print out the existing stack info */
 870                         stack = (unsigned long *)&stack;
 871                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 872                 }
 873         } else
 874                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 875
 876         printk(KERN_NOTICE "Stack info:\n");
 877         decode_address(buf, (unsigned int)stack);
 878         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 879
 880         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 881                 printk(KERN_NOTICE "Invalid stack pointer\n");
 882                 return;
 883         }
 884
 885         /* First thing is to look for a frame pointer */
 886         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 887                 if (*addr & 0x1)
 888                         continue;
 889                 ins_addr = (unsigned short *)*addr;
 890                 ins_addr--;
 891                 if (is_bfin_call(ins_addr))
 892                         fp = addr - 1;
 893
 894                 if (fp) {
 895                         /* Let's check to see if it is a frame pointer */
 896                         while (fp >= (addr - 1) && fp < endstack
 897                                && fp && ((unsigned int) fp & 0x3) == 0)
 898                                 fp = (unsigned int *)*fp;
 899                         if (fp == 0 || fp == endstack) {
 900                                 fp = addr - 1;
 901                                 break;
 902                         }
 903                         fp = 0;
 904                 }
 905         }
 906         if (fp) {
 907                 frame = fp;
 908                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 909         } else
 910                 frame = 0;
 911
 912         /*
 913          * Now that we think we know where things are, we
 914          * walk the stack again, this time printing things out
 915          * incase there is no frame pointer, we still look for
 916          * valid return addresses
 917          */
 918
 919         /* First time print out data, next time, print out symbols */
 920         for (j = 0; j <= 1; j++) {
 921                 if (j)
 922                         printk(KERN_NOTICE "Return addresses in stack:\n");
 923                 else
 924                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 925
 926                 fp = frame;
 927                 frame_no = 0;
 928
 929                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 930                      addr < endstack; addr++, i++) {
 931
 932                         ret_addr = 0;
 933                         if (!j && i % 8 == 0)
 934                                 printk(KERN_NOTICE "%p:",addr);
 935
 936                         /* if it is an odd address, or zero, just skip it */
 937                         if (*addr & 0x1 || !*addr)
 938                                 goto print;
 939
 940                         ins_addr = (unsigned short *)*addr;
 941
 942                         /* Go back one instruction, and see if it is a CALL */
 943                         ins_addr--;
 944                         ret_addr = is_bfin_call(ins_addr);
 945  print:
 946                         if (!j && stack == (unsigned long *)addr)
 947                                 printk("[%08x]", *addr);
 948                         else if (ret_addr)
 949                                 if (j) {
 950                                         decode_address(buf, (unsigned int)*addr);
 951                                         if (frame == addr) {
 952                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 953                                                 continue;
 954                                         }
 955                                         printk(KERN_NOTICE "    address : %s\n", buf);
 956                                 } else
 957                                         printk("<%08x>", *addr);
 958                         else if (fp == addr) {
 959                                 if (j)
 960                                         frame = addr+1;
 961                                 else
 962                                         printk("(%08x)", *addr);
 963
 964                                 fp = (unsigned int *)*addr;
 965                                 frame_no++;
 966
 967                         } else if (!j)
 968                                 printk(" %08x ", *addr);
 969                 }
 970                 if (!j)
 971                         printk("\n");
 972         }
 973 #endif
 974 }
 975 EXPORT_SYMBOL(show_stack);
 976
 977 void dump_stack(void)
 978 {
 979         unsigned long stack;
 980 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 981         int tflags;
 982 #endif
 983         trace_buffer_save(tflags);
 984         dump_bfin_trace_buffer();
 985         show_stack(current, &stack);
 986         trace_buffer_restore(tflags);
 987 }
 988 EXPORT_SYMBOL(dump_stack);
 989
 990 void dump_bfin_process(struct pt_regs *fp)
 991 {
 992 #ifdef CONFIG_DEBUG_VERBOSE
 993         /* We should be able to look at fp->ipend, but we don't push it on the
 994          * stack all the time, so do this until we fix that */
 995         unsigned int context = bfin_read_IPEND();
 996
 997         if (oops_in_progress)
 998                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 999
1000         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
1001                 verbose_printk(KERN_NOTICE "HW Error context\n");
1002         else if (context & 0x0020)
1003                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
1004         else if (context & 0x3FC0)
1005                 verbose_printk(KERN_NOTICE "Interrupt context\n");
1006         else if (context & 0x4000)
1007                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
1008         else if (context & 0x8000)
1009                 verbose_printk(KERN_NOTICE "Kernel process context\n");
1010
1011         /* Because we are crashing, and pointers could be bad, we check things
1012          * pretty closely before we use them
1013          */
1014         if ((unsigned long)current >= FIXED_CODE_START &&
1015             !((unsigned long)current & 0x3) && current->pid) {
1016                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1017                 if (current->comm >= (char *)FIXED_CODE_START)
1018                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
1019                                 current->comm, current->pid);
1020                 else
1021                         verbose_printk(KERN_NOTICE "COMM= invalid");
1022
1023                 printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu);
1024                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
1025                         verbose_printk(KERN_NOTICE
1026                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
1027                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
1028                                 (void *)current->mm->start_code,
1029                                 (void *)current->mm->end_code,
1030                                 (void *)current->mm->start_data,
1031                                 (void *)current->mm->end_data,
1032                                 (void *)current->mm->end_data,
1033                                 (void *)current->mm->brk,
1034                                 (void *)current->mm->start_stack);
1035                 else
1036                         verbose_printk(KERN_NOTICE "invalid mm\n");
1037         } else
1038                 verbose_printk(KERN_NOTICE
1039                                "No Valid process in current context\n");
1040 #endif
1041 }
1042
1043 void dump_bfin_mem(struct pt_regs *fp)
1044 {
1045 #ifdef CONFIG_DEBUG_VERBOSE
1046         unsigned short *addr, *erraddr, val = 0, err = 0;
1047         char sti = 0, buf[6];
1048
1049         erraddr = (void *)fp->pc;
1050
1051         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1052
1053         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1054              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1055              addr++) {
1056                 if (!((unsigned long)addr & 0xF))
1057                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1058
1059                 if (!get_instruction(&val, addr)) {
1060                                 val = 0;
1061                                 sprintf(buf, "????");
1062                 } else
1063                         sprintf(buf, "%04x", val);
1064
1065                 if (addr == erraddr) {
1066                         verbose_printk("[%s]", buf);
1067                         err = val;
1068                 } else
1069                         verbose_printk(" %s ", buf);
1070
1071                 /* Do any previous instructions turn on interrupts? */
1072                 if (addr <= erraddr &&                          /* in the past */
1073                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1074                       val == 0x017b))                           /* [SP++] = RETI */
1075                         sti = 1;
1076         }
1077
1078         verbose_printk("\n");
1079
1080         /* Hardware error interrupts can be deferred */
1081         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1082             oops_in_progress)){
1083                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1084 #ifndef CONFIG_DEBUG_HWERR
1085                 verbose_printk(KERN_NOTICE
1086 "The remaining message may be meaningless\n"
1087 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1088 #else
1089                 /* If we are handling only one peripheral interrupt
1090                  * and current mm and pid are valid, and the last error
1091                  * was in that user space process's text area
1092                  * print it out - because that is where the problem exists
1093                  */
1094                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1095                      (current->pid && current->mm)) {
1096                         /* And the last RETI points to the current userspace context */
1097                         if ((fp + 1)->pc >= current->mm->start_code &&
1098                             (fp + 1)->pc <= current->mm->end_code) {
1099                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1100                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1101                                 show_regs(fp + 1);
1102                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1103                         }
1104                 }
1105 #endif
1106         }
1107 #endif
1108 }
1109
1110 void show_regs(struct pt_regs *fp)
1111 {
1112 #ifdef CONFIG_DEBUG_VERBOSE
1113         char buf [150];
1114         struct irqaction *action;
1115         unsigned int i;
1116         unsigned long flags = 0;
1117         unsigned int cpu = raw_smp_processor_id();
1118         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1119
1120         verbose_printk(KERN_NOTICE "\n");
1121         if (CPUID != bfin_cpuid())
1122                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1123                         "but running on:0x%04x (Rev %d)\n",
1124                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1125
1126         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1127                 CPU, bfin_compiled_revid());
1128
1129         if (bfin_compiled_revid() !=  bfin_revid())
1130                 verbose_printk("(Detected 0.%d)", bfin_revid());
1131
1132         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1133                 get_cclk()/1000000, get_sclk()/1000000,
1134 #ifdef CONFIG_MPU
1135                 "mpu on"
1136 #else
1137                 "mpu off"
1138 #endif
1139                 );
1140
1141         verbose_printk(KERN_NOTICE "%s", linux_banner);
1142
1143         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1144         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
1145                 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1146         if (fp->ipend & EVT_IRPTEN)
1147                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
1148         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1149                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1150                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
1151         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1152                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
1153         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1154                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1155                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1156 #ifdef EBIU_ERRMST
1157                 /* If the error was from the EBIU, print it out */
1158                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1159                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1160                                 bfin_read_EBIU_ERRMST());
1161                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1162                                 bfin_read_EBIU_ERRADD());
1163                 }
1164 #endif
1165         }
1166         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1167                 fp->seqstat & SEQSTAT_EXCAUSE);
1168         for (i = 2; i <= 15 ; i++) {
1169                 if (fp->ipend & (1 << i)) {
1170                         if (i != 4) {
1171                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1172                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1173                         } else
1174                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1175                 }
1176         }
1177
1178         /* if no interrupts are going off, don't print this out */
1179         if (fp->ipend & ~0x3F) {
1180                 for (i = 0; i < (NR_IRQS - 1); i++) {
1181                         if (!in_atomic)
1182                                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
1183
1184                         action = irq_desc[i].action;
1185                         if (!action)
1186                                 goto unlock;
1187
1188                         decode_address(buf, (unsigned int)action->handler);
1189                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1190                         for (action = action->next; action; action = action->next) {
1191                                 decode_address(buf, (unsigned int)action->handler);
1192                                 verbose_printk(", %s", buf);
1193                         }
1194                         verbose_printk("\n");
1195 unlock:
1196                         if (!in_atomic)
1197                                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1198                 }
1199         }
1200
1201         decode_address(buf, fp->rete);
1202         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1203         decode_address(buf, fp->retn);
1204         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1205         decode_address(buf, fp->retx);
1206         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1207         decode_address(buf, fp->rets);
1208         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1209         decode_address(buf, fp->pc);
1210         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1211
1212         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1213             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1214                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1215                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1216                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1217                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1218         }
1219
1220         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1221         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1222                 fp->r0, fp->r1, fp->r2, fp->r3);
1223         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1224                 fp->r4, fp->r5, fp->r6, fp->r7);
1225         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1226                 fp->p0, fp->p1, fp->p2, fp->p3);
1227         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1228                 fp->p4, fp->p5, fp->fp, (long)fp);
1229         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1230                 fp->lb0, fp->lt0, fp->lc0);
1231         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1232                 fp->lb1, fp->lt1, fp->lc1);
1233         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1234                 fp->b0, fp->l0, fp->m0, fp->i0);
1235         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1236                 fp->b1, fp->l1, fp->m1, fp->i1);
1237         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1238                 fp->b2, fp->l2, fp->m2, fp->i2);
1239         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1240                 fp->b3, fp->l3, fp->m3, fp->i3);
1241         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1242                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1243
1244         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1245                 rdusp(), fp->astat);
1246
1247         verbose_printk(KERN_NOTICE "\n");
1248 #endif
1249 }
1250
1251 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1252 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1253 #endif
1254
1255 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1256
1257 asmlinkage int sys_bfin_spinlock(int *p)
1258 {
1259         int ret, tmp = 0;
1260
1261         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1262         ret = get_user(tmp, p);
1263         if (likely(ret == 0)) {
1264                 if (unlikely(tmp))
1265                         ret = 1;
1266                 else
1267                         put_user(1, p);
1268         }
1269         spin_unlock(&bfin_spinlock_lock);
1270         return ret;
1271 }
1272
1273 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1274 {
1275         void (*curr_handler)(void);
1276
1277         if (exception > 0x3F)
1278                 return -EINVAL;
1279
1280         curr_handler = ex_table[exception];
1281
1282         if (curr_handler != ex_replaceable)
1283                 return -EBUSY;
1284
1285         ex_table[exception] = handler;
1286
1287         return 0;
1288 }
1289 EXPORT_SYMBOL(bfin_request_exception);
1290
1291 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1292 {
1293         void (*curr_handler)(void);
1294
1295         if (exception > 0x3F)
1296                 return -EINVAL;
1297
1298         curr_handler = ex_table[exception];
1299
1300         if (curr_handler != handler)
1301                 return -EBUSY;
1302
1303         ex_table[exception] = ex_replaceable;
1304
1305         return 0;
1306 }
1307 EXPORT_SYMBOL(bfin_free_exception);
1308
1309 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1310 {
1311         switch (cplb_panic) {
1312         case CPLB_NO_UNLOCKED:
1313                 printk(KERN_EMERG "All CPLBs are locked\n");
1314                 break;
1315         case CPLB_PROT_VIOL:
1316                 return;
1317         case CPLB_NO_ADDR_MATCH:
1318                 return;
1319         case CPLB_UNKNOWN_ERR:
1320                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1321                 break;
1322         }
1323
1324         oops_in_progress = 1;
1325
1326         dump_bfin_process(fp);
1327         dump_bfin_mem(fp);
1328         show_regs(fp);
1329         dump_stack();
1330         panic("Unrecoverable event");
1331 }